Photo of an alderfly larva among rocks and gravel in an aquarium.

    Alderfly Larvae

    Sialis spp.
    American eel side view photo with black background

    American Eel

    Anguilla rostrata
    Photo of a spotted fishing spider perched on the water's surface amid floating duckweed plants

    Aquatic Spiders

    Dolomedes spp., Tetragnatha spp., and others
    brokenray

    Arkansas Brokenray

    Lampsilis reeveiana
    Arkansas darter, female, side view photo with black background

    Arkansas Darter

    Etheostoma cragini
    Photo of backswimmer, side view

    Backswimmers

    About 32 North American species in the family Notonectidae
    Banded sculpin side view photo with black background

    Banded Sculpin

    Cottus carolinae
    Black bullhead side view photo with black background

    Black Bullhead

    Ameiurus melas
    Black River madtom side view photo with black background

    Black River Madtom

    Noturus mayden
    Bluegill male in spawning colors, side view photo with black background

    Bluegill

    Lepomis macrochirus
    Brindled madtom side view photo with black background

    Brindled Madtom

    Noturus miurus
    Brown trout female side view photo with black background

    Brown Trout

    Salmo trutta
    Gray, speckled, translucent gelatinous blob cut in half to show structure

    Bryozoans (Moss Animals)

    Freshwater species in the phylum Bryozoa
    butterfly

    Butterfly

    Ellipsaria lineolata
    Photo of caddisfly larva with case made of detritus

    Caddisfly Larvae

    Various species in the order Trichoptera
    Chain pickerel side view photo with black background

    Chain Pickerel

    Esox niger
    Checkered madtom side view photo with black background

    Checkered Madtom

    Noturus flavater
    Chestnut lamprey side view photo with black background

    Chestnut Lamprey

    Ichthyomyzon castaneus
    Common carp side view photo with black background

    Common Carp

    Cyprinus carpio
    invasive icon

    Invasive

    Common shiner side view photo with black background

    Common Shiner

    Luxilus cornutus
    Photo of crane fly larva

    Crane Fly Larvae

    There are over 500 species of crane flies in North America.
    Crystal darter side view photo with black background

    Crystal Darter

    Crystallaria asprella
    exclamation mark

    Endangered

    Orangethroat darter male in spawning colors, side view photo with black background

    Darters

    Etheostoma, Percina, Ammocrypta, and Crystallaria spp.
    deertoe

    Deertoe

    Truncilla truncata
    Photo of a devil crayfish.

    Devil Crayfish

    Lacunicambarus aff. diogenes
    elktoe

    Elktoe

    Alasmidonta marginata
    ellipse

    Ellipse and Bleedingtooth

    Venustaconcha ellipsiformis and V. pleasii
    fatmucket

    Fatmucket

    Lampsilis siliquoidea
    Photo of a fishfly larva crawling among rocks in an aquarium.

    Fishfly Larvae

    Chauliodes, Neohermes, and Nigronia spp. (in eastern US)
    fragile papershell

    Fragile Papershell

    Leptodea fragilis
    Photo of a freckled crayfish.

    Freckled Crayfish

    Cambarus maculatus
    Freckled madtom side view photo with black background

    Freckled Madtom

    Noturus nocturnus
    Monkey Face Mussel

    Freshwater Mussels

    Bivalve molluscs in order Unionoida
    Photo of several prosobranch pond snails crawling on a rock.

    Gilled Aquatic Snails (Prosobranch Pond Snails)

    Over 20 Missouri species in former subclass Prosobranchia
    Photo of a golden crayfish viewed through the surface of creek water.

    Golden Crayfish

    Faxonius luteus (formerly Orconectes luteus)
    Golden redhorse side view photo with black background

    Golden Redhorse

    Moxostoma erythrurum
    Golden shiner male, side view photo with black background

    Golden Shiner

    Notemigonus crysoleucas
    Goldeye side view photo with black background

    Goldeye

    Hiodon alosoides
    Goldfish side view photo with black background

    Goldfish

    Carassius auratus
    Goldstripe darter side view photo with black background

    Goldstripe Darter

    Etheostoma parvipinne
    exclamation mark

    Endangered

    Green sunfish male, side view photo with black background

    Green Sunfish

    Lepomis cyanellus
    Greenside darter female, side view photo with black background

    Greenside Darter

    Etheostoma blennioides
    Hornyhead chub female, side view photo with black background

    Hornyhead Chub

    Nocomis biguttatus
    Photo of a deer fly larva, probably in a petri dish, on a gray background.

    Horse and Deer Fly Larvae

    Tabanus, Chrysops, and related genera
    Photo of a horsehair worm in an aquarium

    Horsehair Worms

    About 350 species scientifically described.
    No photo available

    Hydras

    Various species in the genus Hydra
    Logperch side view photo with black background

    Logperch

    Percina caprodes
    Longear sunfish, spawning male, side view photo with black background

    Longear Sunfish

    Lepomis megalotis
    Longnose darter side view photo with black background

    Longnose Darter

    Percina nasuta
    exclamation mark

    Endangered

    Photo of a longpincered crayfish.

    Longpincered Crayfish

    Faxonius longidigitus (formerly Orconectes longidigitus)

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